910926 - what's the difference between -T and -t?

in the first line of perl script, i see:
#!/usr/bin/perl -wT
i think if i use -wT instead of -wt, it may cause the script to stop at a specified line which taint mode is checked. while if i use -wt just a warning is generated and execution of the perl script is not stopped.
am i right?

Yes, that is more or less the basic idea. From the Perlrun manpage documentation:



See http://perldoc.perl.org/perlrun.html for more details.

BTW, the -w option should no longer be used for new code, use the 'use warnings' pragma instead.